Looks like there are actually two different titles--Highland Clans and Scotland's Clans--with two seasons of Scotland's Clans.

Scotland's Clans
Series 1 -- Armstrong, Cameron, Douglas, Maclean, The Stewarts, Grant.

Series 2 -- MacNeil, Scott, Gordon, Leslie, Robertson, Hamilton.

Highland Clans -- MacGregor, MacDonald, MacLeod, Campbell, Fraser, MacKenzie.